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Mozilla Firefox

44 Open tabs with one click

Instead of right-clicking a link and choosing Open Link in New Tab,
click a link with your mouse's scroll-wheel button to open it in a new
tab. You can also click that tab with your scroll wheel to close it.
(You may have to disable any function assigned to your click wheel for
this to work, however.)
Mozilla Firefox

45 One-click combos

Don't have a scroll wheel? Hold down Ctrl while left-clicking a link
to open a URL in a new tab, or hold Shift and left-click to open a URL
in a new window.

46 More on Autocomplete

To eliminate your AutoComplete history in Firefox, go to Tools >
Options > Privacy. In the Saved Form Information area, click the Clear
button. To disable this feature entirely, click on the plus symbol
next to the Saved Form Information area and uncheck "Save information
I enter in web page forms."

47 Keep tabs on your tabs

You can control how new tabs open in Firefox in one of three ways:
Open the page in a new window, open the page in a new tab in the front
window, or replace the current page in the front window. Click the
Advanced section of the Options window to customise it to your liking.

48 Smooth sailing

Put an end to jerky document scrolling by enabling Firefox's "Use
smooth scrolling" feature in the Advanced section of the Options
window.

49 Search in shorthand

Type a word in the address bar, then hit Ctrl+Enter to automatically
add http://www and .com to the beginning and end, respectively, of the
word. (Ctrl+Shift+Enter adds .org, and Shift+Enter adds .net.)

50 Zoom in and out

Hit Ctrl and the plus sign to increase text size on your current Web
page or Ctrl and the minus to decrease it. To restore the original
size, hit Ctrl+0.

51 Open a tab

To open a particular tab in Firefox, hit Ctrl+1 through Ctrl+9. Tabs
aren't numbered, though, so you'll have to physically count them.

52 Use live bookmarks

Get the latest headlines from your favourite RSS news sites and blogs.
Just click the square, bright-orange icon in the bottom right corner
of your browser and click "OK to save as bookmark." The Live Bookmark
will now function as your RSS aggregator.